Same comment as for the previous one - please split the actual bug
fix from the code movement.
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From: David Stevens
Calling the iommu_dma_sync_*_for_cpu functions during unmap can cause
two copies out of the swiotlb buffer. Fold __iommu_dma_unmap_swiotlb
into iommu_dma_unmap_page, and directly call arch_sync_dma_for_cpu
instead of iommu_dma_sync_single_for_cpu to avoid this double sync.
